一个关于正则在IE和firefox不一致的问题

function setCookie(oName,oValue,oExpires,oPath,oDomain,oSecure)
{
    var myCookie = oName + "=" + encodeURIComponent(oValue) + ";";
    if(oExpires)
        myCookie += "expires=" + oExpires.toGMTString() + ";";
    if(oPath)
        myCookie += "path=" + oPath + ";";
    if(oDomain)
        myCookie += "domain=" + oDomain + ";";
    if(oSecure)
        myCookie += "secure=" + oSecure + ";";
    document.cookie = myCookie;
}
function getCookie(oName)
{
    var reg = "(?:;)?" + oName + "=([^;]*);?";
    var regExp = new RegExp(reg);
    if(regExp.test(document.cookie))
        return decodeURIComponent(RegExp.$1);
    else
        return null;
}
setCookie("name","myname");
setCookie("father","myfather",new Date(Date.parse(11/30/2009)));
setCookie("women","mywomen",new Date(Date.parse(11/4/2009)));
alert(document.cookie);
alert(getCookie("name"));
alert(getCookie("father"));
alert(getCookie("women"));